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Because hydrogen is the most common element in the universe and also it has a spectral emission line in the microwave radio part of the spectrum making it easier to track with a radio telescope.

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Q: Why is hydrogen emission useful in mapping the arms of the milky way?
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In the milky way the most abundant gas in emission nebulae is?

The most abundant gas in emission nebulae in the Milky Way is hydrogen. Emission nebulae are commonly made up of ionized hydrogen gas that emits light as it recombines with electrons. This creates the vibrant pink and red colors often seen in these nebulae.


Emission nebula take up about how much of the Milky Way galaxy?

Considering the size of the Milky Way Galaxy and the amount of "empty" space, the amount of space an emission nebula occupies is so small as to be infinitesimal and impossible to equate to a volume.


Why hydrogen turn water milky?

When hydrogen gas is bubbled through water, it forms tiny hydrogen bubbles that become trapped on the surface of the water droplets. These bubbles scatter light, creating a milky or cloudy appearance in the water. This effect is known as the Tyndall effect.


What gas are the star in the milky way galaxy made up of?

Mostly Hydrogen and Helium.


Are there gas clouds in the Milky Way?

Yes, there are huge clouds of hydrogen gas, called nebulae.


How would you test carbon dioxide to show that it was hydrogen?

Carbon dioxide form a milky suspension of calcium carbonate in calcium hydroxide; hydrogen doesn't react. But hydrogen react with oxygen when a flame exist.


Does the Milky Way Galaxy have an active galactic nucleus?

Our Milky Way has a supermassive black hole at its nucleus. It is an active radio source. It is probably not a Seyfert galaxy, which is a galaxy of a type characterized by a bright compact core that shows strong infrared emission, though.


What happens when hydrogen gas is passed through lime water?

When hydrogen gas is passed through lime water, no immediate change will be observed. Lime water is a solution of calcium hydroxide, which is basic. Since hydrogen gas is neutral, it does not react with lime water to produce a visible change.


What happen when Water Is Aded To Lime?

When hydrogen is added to lime water, the solution becomes milky. This is because it forms calcium carbonate.


What is the test for the gas evolved when sodium hydrogen carbonate is added to acetic acid?

The gas evolved is carbon dioxide. The test is that it turns lime water milky.


Which of these Tracers can best be used to map the spiral structure of our galaxyClouds ofcool hydrogen H2 regions OB associations Young open clusters?

The best tracers to map the spiral structure of our galaxy are young open clusters, OB associations, and H2 regions. These are associated with regions of active star formation and are typically found along the spiral arms, making them useful markers for tracing the structure of the Milky Way. Clouds of cool hydrogen are also important tracers, as they often coincide with regions of ongoing star formation.


What is the Milky Way comprised of?

Strictly by number of atoms, our galaxy is about 90% Hydrogen, very close to 10% Helium, and very, very small traces of everything else.